From 47c7734042e3a38cd2cc5006e5134dc9659488ea Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@users.noreply.github.com>
Date: Fri, 6 May 2022 08:35:34 +0200
Subject: [PATCH] - add -compatmode for setting a compatibility mode on startup

As a replacement for +compatmode not working as intended.
---
 src/d_main.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/d_main.cpp b/src/d_main.cpp
index 86515ce61..43f368552 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -3119,6 +3119,13 @@ static int D_InitGame(const FIWADInfo* iwad_info, TArray<FString>& allwads, TArr
 
 	// Base systems have been inited; enable cvar callbacks
 	FBaseCVar::EnableCallbacks ();
+	
+	// +compatmode cannot be used on the command line, so use this as a substitute
+	auto compatmodeval = Args->CheckValue("-compatmode");
+	if (compatmodeval)
+	{
+		compatmode = (int)strtoll(compatmodeval, nullptr, 10);
+	}
 
 	if (!batchrun) Printf ("S_Init: Setting up sound.\n");
 	S_Init ();